Last month, I made a post on this forum in which I gave instructions for inexpensively building a chronograph for measuring arrow speeds, and how to use free software to read the results. Many people took interest in this project, and like other projects on the DIY forum, the input from other members helped the project to evolve into a much more user-friendly tool.
Of particular note, helsyeah decided to work on his own software called COIL CHRONO for using a DIY Coil Chronograph. He is planning to make this software available, along with instructions and source code, to the members on the archerytalk.com forums. I really want to thank helsyeah for taking on this project and for the enormous amount of time he put into making such a useful and effective program.
Because this project is so simple to build, almost everyone who has built one so far has come up with their own method using the materials available to them. In order to assist others who would like to build a coil chronograph, I decided to describe another version using inexpensive materials that are readily available. I do not claim that this is the best or cheapest method, but it does work well and provides a standard construction technique.
Attached is a .zip file containing a .pdf of the assembly instructions.